\documentclass{article}
\usepackage[x11names, rgb]{xcolor}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{snakes,arrows,shapes}
\usepackage{amsmath}
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\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{0pt}%
\usetikzlibrary{automata}%

\begin{document}
\pagestyle{empty}
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\enlargethispage{100cm}
% Start of code
\begin{tikzpicture}[>=latex',join=bevel,]
\tikzstyle{every state}=[draw=blue!50,very thick,fill=blue!20]%
\node (q0) at (40bp,370bp) [state] {$q_{0}$};
  \node (q4) at (60bp,18bp) [state] {$q_{4}$};
  \node (q3) at (153bp,106bp) [state] {$q_{3}$};
  \node (q2) at (153bp,194bp) [state] {$q_{2}$};
  \node (q1) at (40bp,282bp) [state] {$q_{1}$};
  \draw [->] (q0) ..controls (40bp,340bp) and (40bp,324bp)  .. node[auto] {$PA_And_Start--004_PLink#Start$} (q1);
  \draw [->] (q4) ..controls (41bp,59bp) and (24bp,102bp)  .. (17bp,142bp) .. controls (11bp,181bp) and (21bp,226bp)  .. node[auto] {$PA_And_Start--004_PLink#Start$} (q1);
  \draw [->] (q3) ..controls (122bp,77bp) and (100bp,56bp)  .. node[auto] {$\overline{PA_And_User_PLink#Complete_People_Activity}$} (q4);
  \draw [->] (q2) ..controls (198bp,176bp) and (225bp,161bp)  .. (214bp,142bp) .. controls (208bp,131bp) and (198bp,123bp)  .. node[auto] {$PA_And_User_PLink#Complete_People_Activity$} (q3);
  \draw [->] (q1) ..controls (76bp,254bp) and (106bp,231bp)  .. node[auto] {$\overline{PA_And_User_PLink#Receive_Task}$} (q2);
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\end{tikzpicture}
% End of code

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\end{document}
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